Card Range To Study

38 Cards in this Set

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The IEEE specification in Project 802 for the Logical Link Control (LLC) sublayer of the OSI model's Data Link layer

802.2

The IEEE specification in Project 802 for Carrier Sense Multiple Access/Collision Detection (CSMA/CD) networks (more commonly called "Ethernet"). Ethernet users can attempt to access the medium any time it's perceived as "quiet", but they must back off and try to transmit again if they detect any collisions after transmission begins

802.3

The IEEE specification in Project 802 for token ring LANs, which map a circulating ring structure onto a physical star and circulate a token to control access to the medium

802.5

The IEEE specification in Project 802 for wireless networks.

802.11

The IEEE specification that covers emerging standards for wireless personal area networks (WPANs)

802.15

The IEEE specification that covers wireless metropolitan area networks (MANs).

802.16

In the context of the Network layer and routing, the process whereby a router consults a list of rules before forwarding an incoming packet. The rules determine whether a packet meeting certain criteria (such as source and destination address) should be permitted to reach the intended destination

Data frames with destination addresses that specify that all computers on a network must read and process these frames

broadcast frames

A mathematical recipe that generates a specific value, called a checksum, based on a frame's contents. This is calculated twice, once before transmission and again on receipt.

Cyclical Redundancy Check (CRC)

Layer 2 in the OSI reference model is responsible for managing access to the networking medium and ensuring error-free delivery of data frames from sender to receiver

Data Link layer

The frame component that's the actual data being sent across a network. The size of this section can vary from less than 50 bytes to 16KB, depending on the network type.

data section

The process of stripping the header from a PDU as it makes its way up the communication layers before being passed to the next higher layer

decapsulation

The process of adding header information to a PDU as it makes its way down the communication layers before being passed to the next lower layer

encapsulation

The representation of 0s and 1s as a physical signal, such as electrical voltage or a light pulse

encoding

A process designed to regulate information transfer between a sender and a receiver. _________ is often necessary when there's a speed differential between sender and receiver.

flow control

The basic unit for network traffic as it travels across the medium. Data is broken into these smaller, more manegeable pieces for faster, more efficient delivery.

frame

Information added to the end of the data being sent in a frame; it generally contains error-checking information, such as the CRC.

frame trailer

Information added to the beginning of data being sent, which contains, among other things, addressing and sequencing information.

frame header

The internationl standards-setting body based in Geneva, Switzerland, that sets worldwide technology standards.

International Organization for Standardization

The functional subdivisions of the OSI reference model.

layers

The upper usblayer of the IEEE Project 802 model for the Data Link layer of the OSI model. It handles error-free delivery and controls the flow of frames between sender and receiver across a network.

Logical Link Control (LLC)

The lower sublayer of the IEEE Project 802 model for the Data Link layer of the OSI model. It handles access to network media and mapping between logical and physical network addresses for NICs.

Media Access Control (MAC)

Frames that use a special destination address so that any computer listening for this address can read and process the frame's data.

multicast frames

Layer 3 of the OSI reference model handles addressing and routing PDUs across internetworks in which sender and receiver must traverse multiple networks.

Network layer

The family of ISO standards developed in the 1970s to facilitate functionality of networking services among dissimilar computers on a global scale. The OSI initiative was unsuccessful, owing to a fatal combination of an all-inclusive standards-setting effort and a failure to develop standard protocol interfaces to help developers implement its manifold requirements.

Open Systems Interconnection (OSI)

ISO Standard 7498 defines a frame of reference for understanding networks by dividing the process of network communication into seven layers. Each layer is defined in terms of the services and data it handles on behalf of the layer directly above it and the services abd data it needs from the layer directly below it.

At Layer 6 of the OSI reference model, data can be encrypted and/or compressed to facilitate delivery. Platform specific-application formats are translated into generic data formats for transmission or from generic data formats into platform-specific application formats for delivery to the Application layer.

Presentation layer

The IEEE effort that produced the collection of 802 networking specifications and standards.

Project 802

A unit of information passed as a self-contained data structure from one layer to another on its way up or down the network protocol stack.

protocol data unit (PDU)

A family of related protocols in which higher layer protocols provide application services and request handling facilities, and lower-layer protocols manage the intricacies of Layers 1 to 4 in the OSI reference model.

protocol suite

A software component that intercepts requests for service from a computer and redirects requests that can't be handled locally across the network to a networked resource that can handle the request.

redirector

A Network-layer service that determines how to deliver an outgoing packet of data from sender to receiver. Routing entails several methods for managing delivery and requires error and status reporting so that senders can determine whether packets are reaching the receivers.

routing

Logical interface points used to transfer information from the LLC sublayer to upper OSI layers.

Service Access Points (SAPs)

Layer 5 of the OSI reference model is responsible for setting up, maintaining, and ending ongoing sequences of communications (called _______) across a network.

Session layer

Layer 4 of the OSI reference model is responsible for fragmenting large PDUs from the Session layer for delivery across the network, inserting integrity controls, and managing delivery mechanisms to allow for error-free reassembly on the receiving end of a network transmission.